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System dynamics and fault diagnosis in a compact vapor compression refrigeration system for avionics cooling applications.

Auteurs : ERKINACI T., ONLER R., SERINCAN M. F.

Type d'article : Article de la RIF

Résumé

The increasing use of high–power-density electronics in avionics creates stringent thermal-management requirements, particularly under harsh and rapidly changing operating conditions. Compact vapor-compression refrigeration (VCR) systems are promising for device-level cooling because they can dissipate high heat fluxes while maintaining low component temperatures. In safety-critical aircraft applications, fault response must be rapid; therefore, understanding the dynamic responses of cooling systems under changing conditions is essential.
This study investigates the dynamic response of a compact VCR system designed for avionics cooling under a targeted set of faults. The specific contribution is an avionics-focused, system-level dynamic fault characterization and FDD-oriented interpretation that emphasizes transient signatures and safety-margin exceedance in compact cold-plate architectures with limited thermal inertia. A comprehensive system-level model is developed, and its credibility is strengthened through experimental comparison under repeatable hard-fault transients
(compressor stop–restart and condenser fan stop–restart). Using the validated model, fault signatures are interpreted in the transient domain, including time-to-threshold wall-temperature exceedance, pressure–enthalpy (p–h) cycle shifts, and controller/actuator responses, enabling rapid fault discrimination. Results show that faults in the electronic expansion valve, compressor, and evaporator can quickly drive the cold-plate wall temperature beyond its maximum allowable limit, underscoring the need for timely fault detection and diagnosis in avionics heat-removal systems. The findings also demonstrate that transient responses provide earlier actionable indicators than conventional steady-state FDD approaches. Overall, the work supports validated dynamic modeling as a foundation for real-time, safety-oriented diagnostics in compact avionics VCR systems.

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Format PDF

Pages : 13 p.

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    20 €

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Détails

  • Titre original : System dynamics and fault diagnosis in a compact vapor compression refrigeration system for avionics cooling applications.
  • Identifiant de la fiche : 30034786
  • Langues : Anglais
  • Sujet : Technologie
  • Source : International Journal of Refrigeration - Revue Internationale du Froid - vol. 185
  • Date d'édition : 05/2026
  • DOI : http://dx.doi.org/10.1016/j.ijrefrig.2026.02.004

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